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Guard cells are the two curved cells on either side of the pore (hole). By changing their shape they can open or close the pore.
When the guard cells absorb water they bend outwards, so that the pore between them opens up. When they lose water they go back to a less curved shape, closing the pore between them.
Guard cells bend outwards when they absorb water because the wall next to the pore is thicker than the outer wall, so blah it stretches less.
Usually, stomata open in the day to let carbon dioxide into the leaf for photosynthesis and to let oxygen (made by photosynthesis) out of the leaf. They close at night, when photosynthesis cannot take place, to prevent the escape of water.
Improved answer-
Guard Cell
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Why do plants have very few guard cells?
Guard cells are usually found on the underside of leaves and they are few in number in order to reduce water loss.
Do all plants have guard cells?
No, not all plants have guard cells. Guard cells are specialized cells found in the epidermis of leaves and stems of plants, particularly in vascular plants, that control the opening and closing of stomata. Non-vascular plants like mosses and liverworts do not have true vascular tissue or stomata with guard cells.
On which layer of epidermis are guard cells found?
Guard cells are found on the epidermis of plant leaves, specifically within the lower epidermis. These specialized cells control the opening and closing of stomata to regulate gas exchange and water loss in the plant.
Do fungi have guard cell?
No, fungi do not have guard cells. Guard cells are specialized cells found in the epidermis of plant leaves that regulate gas exchange by controlling the opening and closing of stomata. Fungi are a separate kingdom of organisms and lack the structures and functions associated with plant physiology, including guard cells and stomata.
Are guard cells alive or dead?
Guard cells are alive. They are specialized cells found in the epidermis of plant leaves that control the opening and closing of stomata to regulate gas exchange and water loss.
What is the name of leaf tissue where the stomata are found?
Stomata are found in the epidermis of leaves, specifically in specialized cells called guard cells. Guard cells surround and control the opening and closing of the stomata to regulate gas exchange and water loss in plants.
What is the difference between a guard cell and other cells?
Answer1. Guard cells have chloroplast, epidermal cells do not have.2. Guard cells are much smaller than the epidermal cells.3. The cell walls of guard cells are not uniform, inner walls are thicker than the outer walls. epidermal cells are unformly thin.
The type of cell that controls the opening and closing of stomata is called?
guard cells
Which structure controls transpiration?
guard cells
Are there chloroplasts in subsidiary cells?
Subsidiary cells do not typically contain chloroplasts. Chloroplasts are found in the guard cells of plant stomata, where they play a role in regulating gas exchange. Subsidiary cells primarily function in supporting and assisting the guard cells in their role in controlling stomatal opening and closing.
What cells guard the opening and closing of the stomata?
The guard cells are specialized cells that control the opening and closing of the stomata in plant leaves. They can change shape to regulate the exchange of gases and water vapor between the leaf and the surrounding environment.
Where leaf pore guard cells found?
They are cells in the leaf epidermis, located arond the stomata. A pair of guard cells open and close each stoma (pore) for gas exchange and transpiration. They are different in shape from the rest of the epidermis cells, and unlike other epidermis cells they also contain chloroplasts.
